diff options
Diffstat (limited to 'drivers/acpi/video_detect.c')
| -rw-r--r-- | drivers/acpi/video_detect.c | 417 |
1 files changed, 233 insertions, 184 deletions
diff --git a/drivers/acpi/video_detect.c b/drivers/acpi/video_detect.c index c42feb2ba..2922f1f25 100644 --- a/drivers/acpi/video_detect.c +++ b/drivers/acpi/video_detect.c @@ -1,106 +1,63 @@ /* + * Copyright (C) 2015 Red Hat Inc. + * Hans de Goede <hdegoede@redhat.com> * Copyright (C) 2008 SuSE Linux Products GmbH * Thomas Renninger <trenn@suse.de> * * May be copied or modified under the terms of the GNU General Public License * * video_detect.c: - * Provides acpi_is_video_device() for early scanning of ACPI devices in scan.c - * There a Linux specific (Spec does not provide a HID for video devices) is - * assigned - * * After PCI devices are glued with ACPI devices * acpi_get_pci_dev() can be called to identify ACPI graphics * devices for which a real graphics card is plugged in * - * Now acpi_video_get_capabilities() can be called to check which - * capabilities the graphics cards plugged in support. The check for general - * video capabilities will be triggered by the first caller of - * acpi_video_get_capabilities(NULL); which will happen when the first - * backlight switching supporting driver calls: - * acpi_video_backlight_support(); - * * Depending on whether ACPI graphics extensions (cmp. ACPI spec Appendix B) * are available, video.ko should be used to handle the device. * * Otherwise vendor specific drivers like thinkpad_acpi, asus-laptop, * sony_acpi,... can take care about backlight brightness. * - * If CONFIG_ACPI_VIDEO is neither set as "compiled in" (y) nor as a module (m) - * this file will not be compiled, acpi_video_get_capabilities() and - * acpi_video_backlight_support() will always return 0 and vendor specific - * drivers always can handle backlight. + * Backlight drivers can use acpi_video_get_backlight_type() to determine + * which driver should handle the backlight. * + * If CONFIG_ACPI_VIDEO is neither set as "compiled in" (y) nor as a module (m) + * this file will not be compiled and acpi_video_get_backlight_type() will + * always return acpi_backlight_vendor. */ #include <linux/export.h> #include <linux/acpi.h> +#include <linux/backlight.h> #include <linux/dmi.h> +#include <linux/module.h> #include <linux/pci.h> - -#include "internal.h" +#include <linux/types.h> +#include <linux/workqueue.h> +#include <acpi/video.h> ACPI_MODULE_NAME("video"); #define _COMPONENT ACPI_VIDEO_COMPONENT -static long acpi_video_support; -static bool acpi_video_caps_checked; +void acpi_video_unregister_backlight(void); -static acpi_status -acpi_backlight_cap_match(acpi_handle handle, u32 level, void *context, - void **return_value) -{ - long *cap = context; +static bool backlight_notifier_registered; +static struct notifier_block backlight_nb; +static struct work_struct backlight_notify_work; - if (acpi_has_method(handle, "_BCM") && - acpi_has_method(handle, "_BCL")) { - ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found generic backlight " - "support\n")); - *cap |= ACPI_VIDEO_BACKLIGHT; - if (!acpi_has_method(handle, "_BQC")) - printk(KERN_WARNING FW_BUG PREFIX "No _BQC method, " - "cannot determine initial brightness\n"); - /* We have backlight support, no need to scan further */ - return AE_CTRL_TERMINATE; - } - return 0; -} +static enum acpi_backlight_type acpi_backlight_cmdline = acpi_backlight_undef; +static enum acpi_backlight_type acpi_backlight_dmi = acpi_backlight_undef; -/* Returns true if the ACPI object is a video device which can be - * handled by video.ko. - * The device will get a Linux specific CID added in scan.c to - * identify the device as an ACPI graphics device - * Be aware that the graphics device may not be physically present - * Use acpi_video_get_capabilities() to detect general ACPI video - * capabilities of present cards - */ -long acpi_is_video_device(acpi_handle handle) +static void acpi_video_parse_cmdline(void) { - long video_caps = 0; - - /* Is this device able to support video switching ? */ - if (acpi_has_method(handle, "_DOD") || acpi_has_method(handle, "_DOS")) - video_caps |= ACPI_VIDEO_OUTPUT_SWITCHING; - - /* Is this device able to retrieve a video ROM ? */ - if (acpi_has_method(handle, "_ROM")) - video_caps |= ACPI_VIDEO_ROM_AVAILABLE; - - /* Is this device able to configure which video head to be POSTed ? */ - if (acpi_has_method(handle, "_VPO") && - acpi_has_method(handle, "_GPD") && - acpi_has_method(handle, "_SPD")) - video_caps |= ACPI_VIDEO_DEVICE_POSTING; - - /* Only check for backlight functionality if one of the above hit. */ - if (video_caps) - acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, - ACPI_UINT32_MAX, acpi_backlight_cap_match, NULL, - &video_caps, NULL); - - return video_caps; + if (!strcmp("vendor", acpi_video_backlight_string)) + acpi_backlight_cmdline = acpi_backlight_vendor; + if (!strcmp("video", acpi_video_backlight_string)) + acpi_backlight_cmdline = acpi_backlight_video; + if (!strcmp("native", acpi_video_backlight_string)) + acpi_backlight_cmdline = acpi_backlight_native; + if (!strcmp("none", acpi_video_backlight_string)) + acpi_backlight_cmdline = acpi_backlight_none; } -EXPORT_SYMBOL(acpi_is_video_device); static acpi_status find_video(acpi_handle handle, u32 lvl, void *context, void **rv) @@ -109,7 +66,7 @@ find_video(acpi_handle handle, u32 lvl, void *context, void **rv) struct pci_dev *dev; struct acpi_device *acpi_dev; - const struct acpi_device_id video_ids[] = { + static const struct acpi_device_id video_ids[] = { {ACPI_VIDEO_HID, 0}, {"", 0}, }; @@ -130,11 +87,23 @@ find_video(acpi_handle handle, u32 lvl, void *context, void **rv) * buggy */ static int video_detect_force_vendor(const struct dmi_system_id *d) { - acpi_video_support |= ACPI_VIDEO_BACKLIGHT_DMI_VENDOR; + acpi_backlight_dmi = acpi_backlight_vendor; + return 0; +} + +static int video_detect_force_video(const struct dmi_system_id *d) +{ + acpi_backlight_dmi = acpi_backlight_video; return 0; } -static struct dmi_system_id video_detect_dmi_table[] = { +static int video_detect_force_native(const struct dmi_system_id *d) +{ + acpi_backlight_dmi = acpi_backlight_native; + return 0; +} + +static const struct dmi_system_id video_detect_dmi_table[] = { /* On Samsung X360, the BIOS will set a flag (VDRV) if generic * ACPI backlight device is used. This flag will definitively break * the backlight interface (even the vendor interface) untill next @@ -174,137 +143,217 @@ static struct dmi_system_id video_detect_dmi_table[] = { DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 5737"), }, }, - { }, -}; - -/* - * Returns the video capabilities of a specific ACPI graphics device - * - * if NULL is passed as argument all ACPI devices are enumerated and - * all graphics capabilities of physically present devices are - * summarized and returned. This is cached and done only once. - */ -long acpi_video_get_capabilities(acpi_handle graphics_handle) -{ - long caps = 0; - struct acpi_device *tmp_dev; - acpi_status status; - if (acpi_video_caps_checked && graphics_handle == NULL) - return acpi_video_support; + /* + * These models have a working acpi_video backlight control, and using + * native backlight causes a regression where backlight does not work + * when userspace is not handling brightness key events. Disable + * native_backlight on these to fix this: + * https://bugzilla.kernel.org/show_bug.cgi?id=81691 + */ + { + .callback = video_detect_force_video, + .ident = "ThinkPad T420", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), + DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T420"), + }, + }, + { + .callback = video_detect_force_video, + .ident = "ThinkPad T520", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), + DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T520"), + }, + }, + { + .callback = video_detect_force_video, + .ident = "ThinkPad X201s", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), + DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X201s"), + }, + }, - if (!graphics_handle) { - /* Only do the global walk through all graphics devices once */ - acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, - ACPI_UINT32_MAX, find_video, NULL, - &caps, NULL); - /* There might be boot param flags set already... */ - acpi_video_support |= caps; - acpi_video_caps_checked = 1; - /* Add blacklists here. Be careful to use the right *DMI* bits - * to still be able to override logic via boot params, e.g.: - * - * if (dmi_name_in_vendors("XY")) { - * acpi_video_support |= - * ACPI_VIDEO_BACKLIGHT_DMI_VENDOR; - *} - */ + /* The native backlight controls do not work on some older machines */ + { + /* https://bugs.freedesktop.org/show_bug.cgi?id=81515 */ + .callback = video_detect_force_video, + .ident = "HP ENVY 15 Notebook", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"), + DMI_MATCH(DMI_PRODUCT_NAME, "HP ENVY 15 Notebook PC"), + }, + }, + { + .callback = video_detect_force_video, + .ident = "SAMSUNG 870Z5E/880Z5E/680Z5E", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), + DMI_MATCH(DMI_PRODUCT_NAME, "870Z5E/880Z5E/680Z5E"), + }, + }, + { + .callback = video_detect_force_video, + .ident = "SAMSUNG 370R4E/370R4V/370R5E/3570RE/370R5V", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), + DMI_MATCH(DMI_PRODUCT_NAME, + "370R4E/370R4V/370R5E/3570RE/370R5V"), + }, + }, + { + /* https://bugzilla.redhat.com/show_bug.cgi?id=1186097 */ + .callback = video_detect_force_video, + .ident = "SAMSUNG 3570R/370R/470R/450R/510R/4450RV", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), + DMI_MATCH(DMI_PRODUCT_NAME, + "3570R/370R/470R/450R/510R/4450RV"), + }, + }, + { + /* https://bugzilla.redhat.com/show_bug.cgi?id=1094948 */ + .callback = video_detect_force_video, + .ident = "SAMSUNG 730U3E/740U3E", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), + DMI_MATCH(DMI_PRODUCT_NAME, "730U3E/740U3E"), + }, + }, + { + /* https://bugs.freedesktop.org/show_bug.cgi?id=87286 */ + .callback = video_detect_force_video, + .ident = "SAMSUNG 900X3C/900X3D/900X3E/900X4C/900X4D", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), + DMI_MATCH(DMI_PRODUCT_NAME, + "900X3C/900X3D/900X3E/900X4C/900X4D"), + }, + }, + { + /* https://bugzilla.redhat.com/show_bug.cgi?id=1163574 */ + .callback = video_detect_force_video, + .ident = "Dell XPS15 L521X", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), + DMI_MATCH(DMI_PRODUCT_NAME, "XPS L521X"), + }, + }, - dmi_check_system(video_detect_dmi_table); - } else { - status = acpi_bus_get_device(graphics_handle, &tmp_dev); - if (ACPI_FAILURE(status)) { - ACPI_EXCEPTION((AE_INFO, status, "Invalid device")); - return 0; - } - acpi_walk_namespace(ACPI_TYPE_DEVICE, graphics_handle, - ACPI_UINT32_MAX, find_video, NULL, - &caps, NULL); - } - ACPI_DEBUG_PRINT((ACPI_DB_INFO, "We have 0x%lX video support %s %s\n", - graphics_handle ? caps : acpi_video_support, - graphics_handle ? "on device " : "in general", - graphics_handle ? acpi_device_bid(tmp_dev) : "")); - return caps; -} -EXPORT_SYMBOL(acpi_video_get_capabilities); + /* Non win8 machines which need native backlight nevertheless */ + { + /* https://bugzilla.redhat.com/show_bug.cgi?id=1187004 */ + .callback = video_detect_force_native, + .ident = "Lenovo Ideapad Z570", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), + DMI_MATCH(DMI_PRODUCT_NAME, "102434U"), + }, + }, + { + /* https://bugzilla.redhat.com/show_bug.cgi?id=1217249 */ + .callback = video_detect_force_native, + .ident = "Apple MacBook Pro 12,1", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."), + DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro12,1"), + }, + }, + { }, +}; -static void acpi_video_caps_check(void) +/* This uses a workqueue to avoid various locking ordering issues */ +static void acpi_video_backlight_notify_work(struct work_struct *work) { - /* - * We must check whether the ACPI graphics device is physically plugged - * in. Therefore this must be called after binding PCI and ACPI devices - */ - if (!acpi_video_caps_checked) - acpi_video_get_capabilities(NULL); + if (acpi_video_get_backlight_type() != acpi_backlight_video) + acpi_video_unregister_backlight(); } -bool acpi_osi_is_win8(void) +static int acpi_video_backlight_notify(struct notifier_block *nb, + unsigned long val, void *bd) { - return acpi_gbl_osi_data >= ACPI_OSI_WIN_8; + struct backlight_device *backlight = bd; + + /* A raw bl registering may change video -> native */ + if (backlight->props.type == BACKLIGHT_RAW && + val == BACKLIGHT_REGISTERED) + schedule_work(&backlight_notify_work); + + return NOTIFY_OK; } -EXPORT_SYMBOL(acpi_osi_is_win8); -/* Promote the vendor interface instead of the generic video module. - * This function allow DMI blacklists to be implemented by externals - * platform drivers instead of putting a big blacklist in video_detect.c - * After calling this function you will probably want to call - * acpi_video_unregister() to make sure the video module is not loaded +/* + * Determine which type of backlight interface to use on this system, + * First check cmdline, then dmi quirks, then do autodetect. + * + * The autodetect order is: + * 1) Is the acpi-video backlight interface supported -> + * no, use a vendor interface + * 2) Is this a win8 "ready" BIOS and do we have a native interface -> + * yes, use a native interface + * 3) Else use the acpi-video interface + * + * Arguably the native on win8 check should be done first, but that would + * be a behavior change, which may causes issues. */ -void acpi_video_dmi_promote_vendor(void) +enum acpi_backlight_type acpi_video_get_backlight_type(void) { - acpi_video_caps_check(); - acpi_video_support |= ACPI_VIDEO_BACKLIGHT_DMI_VENDOR; -} -EXPORT_SYMBOL(acpi_video_dmi_promote_vendor); + static DEFINE_MUTEX(init_mutex); + static bool init_done; + static long video_caps; -/* To be called when a driver who previously promoted the vendor - * interface */ -void acpi_video_dmi_demote_vendor(void) -{ - acpi_video_caps_check(); - acpi_video_support &= ~ACPI_VIDEO_BACKLIGHT_DMI_VENDOR; -} -EXPORT_SYMBOL(acpi_video_dmi_demote_vendor); + /* Parse cmdline, dmi and acpi only once */ + mutex_lock(&init_mutex); + if (!init_done) { + acpi_video_parse_cmdline(); + dmi_check_system(video_detect_dmi_table); + acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, + ACPI_UINT32_MAX, find_video, NULL, + &video_caps, NULL); + INIT_WORK(&backlight_notify_work, + acpi_video_backlight_notify_work); + backlight_nb.notifier_call = acpi_video_backlight_notify; + backlight_nb.priority = 0; + if (backlight_register_notifier(&backlight_nb) == 0) + backlight_notifier_registered = true; + init_done = true; + } + mutex_unlock(&init_mutex); -/* Returns true if video.ko can do backlight switching */ -int acpi_video_backlight_support(void) -{ - acpi_video_caps_check(); + if (acpi_backlight_cmdline != acpi_backlight_undef) + return acpi_backlight_cmdline; + + if (acpi_backlight_dmi != acpi_backlight_undef) + return acpi_backlight_dmi; - /* First check for boot param -> highest prio */ - if (acpi_video_support & ACPI_VIDEO_BACKLIGHT_FORCE_VENDOR) - return 0; - else if (acpi_video_support & ACPI_VIDEO_BACKLIGHT_FORCE_VIDEO) - return 1; + if (!(video_caps & ACPI_VIDEO_BACKLIGHT)) + return acpi_backlight_vendor; - /* Then check for DMI blacklist -> second highest prio */ - if (acpi_video_support & ACPI_VIDEO_BACKLIGHT_DMI_VENDOR) - return 0; - else if (acpi_video_support & ACPI_VIDEO_BACKLIGHT_DMI_VIDEO) - return 1; + if (acpi_osi_is_win8() && backlight_device_registered(BACKLIGHT_RAW)) + return acpi_backlight_native; - /* Then go the default way */ - return acpi_video_support & ACPI_VIDEO_BACKLIGHT; + return acpi_backlight_video; } -EXPORT_SYMBOL(acpi_video_backlight_support); +EXPORT_SYMBOL(acpi_video_get_backlight_type); /* - * Use acpi_backlight=vendor/video to force that backlight switching - * is processed by vendor specific acpi drivers or video.ko driver. + * Set the preferred backlight interface type based on DMI info. + * This function allows DMI blacklists to be implemented by external + * platform drivers instead of putting a big blacklist in video_detect.c */ -static int __init acpi_backlight(char *str) +void acpi_video_set_dmi_backlight_type(enum acpi_backlight_type type) { - if (str == NULL || *str == '\0') - return 1; - else { - if (!strcmp("vendor", str)) - acpi_video_support |= - ACPI_VIDEO_BACKLIGHT_FORCE_VENDOR; - if (!strcmp("video", str)) - acpi_video_support |= - ACPI_VIDEO_BACKLIGHT_FORCE_VIDEO; - } - return 1; + acpi_backlight_dmi = type; + /* Remove acpi-video backlight interface if it is no longer desired */ + if (acpi_video_get_backlight_type() != acpi_backlight_video) + acpi_video_unregister_backlight(); +} +EXPORT_SYMBOL(acpi_video_set_dmi_backlight_type); + +void __exit acpi_video_detect_exit(void) +{ + if (backlight_notifier_registered) + backlight_unregister_notifier(&backlight_nb); } -__setup("acpi_backlight=", acpi_backlight); |